In the Compton scattering process,the incident $X$-radiation is scattered at an angle of $60^{\circ}$. The wavelength of the scattered radiation is $0.22 \ \mathring{A}$. The wavelength of the incident $X$-radiation in $\mathring{A}$ units is:

  • A
    $0.508$
  • B
    $0.408$
  • C
    $0.232$
  • D
    $0.208$

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